Attorney General William Barr said he supports mail-in balloting for a “limited” amount of people but is concerned about expanding the process.

“I think there’s a range of concerns about mail-in ballots. And let me just clarify here, I’m not talking about a mail-in ballot for a limited number of cases where somebody is going to be traveling around the world, and the way that the state has provided for that is, you mail in your ballot,” Barr said in an interview with NPR last week. “I’m talking about a comprehensive rule where all the ballots are essentially mail-in, and there’s so many occasions for fraud there that cannot be policed.”